Apparatus and method for transmitting and receiving signal in a mobile communication system

1. A method for transmitting a signal by a base station in a wireless communication system, the method comprising: determining a plurality of user equipments (UEs) with a maximum scheduling metric based on channel quality information; generating a common signal for the plurality of UEs; generating a radio unit (RU) specific data signal for each of RUs; multiplexing the common signal and the RU specific data signal; and transmitting, to each of the RUs, the multiplexed signal on a channel through a common public radio interface (CPRI) based on a wired medium; wherein a cell is identified by the plurality of UEs based on the common signal, wherein the cell includes a plurality of sub-cells and each sub-cell is identified by at least one UE which is located in the each sub-cell, based on the RU specific data signal.

2. A base station in a wireless communication system, the base station comprising: a transceiver configured to transmit and receive a signal; and a controller configured to: determine a plurality of user equipments (UEs) with a maximum scheduling metric based on channel quality information, generate a common signal for the plurality of UEs, generate a radio unit (RU) specific data signal for each of RUs, multiplex the common signal and the RU specific data signal, and transmit, to each of RUs, the multiplexed signal through a common public radio interface (CPRI) based on a wired medium, wherein a cell is identified by (the plurality of UEs) based on the common signal, and wherein the cell includes a plurality of sub-cells and each sub-cell is identified by at least one UE which is located in the each sub-cell, based on the RU specific data signal.

3. A method for receiving and transmitting a signal by a radio unit (RU) in a wireless communication system, the method comprising: receiving, from a base station, a signal through a common public radio interface (CPRI) based on a wired medium, wherein the received signal is generated by multiplexing a common signal for a plurality of user equipments (UEs) and a RU specific data signal for each RU; and transmitting the received signal at least one UE; wherein a cell is identified by the plurality of UEs based on the common signal, and wherein the cell includes a plurality of sub-cells and each sub-cell identified by the at least one UE which is located in a sub-cell, based on the RU specific data signal.

4. A radio unit (RU) in a wireless communication system, the RU comprising: a transceiver configured to receive and transmit a signal; and a controller configured to: receive, from a base station, a signal through a common public radio interface (CPRI) based on a wired medium, wherein the received signal is generated by multiplexing a common signal for a plurality of user equipments (UEs) and a RU specific data signal for each RU, and transmit the received signal to at least one UE, wherein a cell is identified by the plurality of UEs based on the common signal, and wherein the cell includes a plurality of sub-cells and each sub-cell is identified by the at least one UE which is located in a sub-cell, based on the RU specific data signal.

5. A method for receiving a signal by a user equipment (UE) in a wireless communication system, the method comprising: receiving a multiplexed signal from at least one radio unit (RU); and obtaining a common signal and a RU specific data signal from the multiplexed signal, wherein a cell is identified based on the common signal, wherein the cell includes a plurality of sub-cells and each sub-cell is identified by a UE which is located in the each sub-cell, based on the RU specific data signal, and wherein the UE has a maximum scheduling metric based on channel quality information.

6. A user equipment (UE) in a wireless communication system, the UE comprising: a transceiver configured to receive and transmit a signal; and a controller configured to: receive a multiplexed signal from at least one radio unit (RU), and obtain a common signal and a RU specific data signal from the multiplexed signal; wherein a cell is identified based on the common signal, wherein the cell includes a plurality of sub-cells and each sub-cell is identified by a UE which is located in the each sub-cell, based on the RU specific data signal, and wherein the UE has a maximum scheduling metric based on channel quality information.

7. The method of claim 1 , wherein the common signal includes at least one of a physical broadcast channel signal, a physical downlink control channel signal, a physical control format indicator channel signal, and a cell-specific reference signal.

8. The base station of claim 2 , wherein the common signal includes at least one of a physical broadcast channel signal, a physical downlink control channel signal, a physical control format indicator channel signal, and a cell-specific reference signal.

9. The method of claim 3 , wherein the common signal includes at least one of a physical broadcast channel signal, a physical downlink control channel signal, a physical control format indicator channel signal, and a cell-specific reference signal.

10. The RU of claim 4 , wherein the common signal includes at least one of a physical broadcast channel signal, a physical downlink control channel signal, a physical control format indicator channel signal, and a cell-specific reference signal.

11. The method of claim 5 , wherein the common signal includes at least one of a physical broadcast channel signal, a physical downlink control channel signal, a physical control format indicator channel signal, and a cell-specific reference signal.

12. The UE of claim 6 , wherein the common signal includes at least one of a physical broadcast channel signal, a physical downlink control channel signal, a physical control format indicator channel signal, and a cell-specific reference signal.